VisualGDB is already integrated into the Visual Studio theming engine. It picks up colors for common controls to match what Visual Studio itself uses, and follows the dark/light themes. Hence, when the new UI is selected, most of the VisualGDB controls should automatically pick up most of the new colors. We will then monitor the popularity of the new GUI, and will gradually resolve the remaining inconsistencies over future releases.
As for redesigning all of our GUI using a new design system, it would not be very practical, as our users would rather prefer new functionality and compatibility with the latest devices, than a lengthy redesign bringing no new functionality, while delaying functional improvements.